Regarding what's realistic, in my view we should be able to achieve 5-8th. Better than 5th would most likely need more quality in the squad an lower than 8th would represent a significant failure. I have no expectations in the cup as it depends entirely on the draw.
I'd say we really need to have a strong push for the playoffs next year, to me that means still in contention (practically not just mathematically) with 2-3 rounds to go. If we don't do that, then there would have to be some very good justification for continuing with the same set up the year after.
It's very important to start to introduce some of the kids next year, they will be the future, and they need to be surrounded by better quality players (either the same ones performing much better, or new additions) to give them a realistic chance to develop.
It will be an interesting 12 months.